| 单词 | copper-slate | 
| 释义 | > as lemmascopper-slate   copper-slate  n. = copper schist n. ΚΠ 1873    J. W. Dawson Story Earth & Man vii. 167  				The copper slates of Thuringia. 1875    R. Hunt  & F. W. Rudler Ure's Dict. Arts 		(ed. 7)	 I. 923  				The copper-slate is sorted, according to its composition. < as lemmas  | 
	
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